Despite the fact that this post does not directly answer your question, MAYBE it will help you somehow:
I agree with others that the easiest way is to upgrade to the latest version of Delphi. However, this is fast (if you ignore UNICODE conversion), but not a cheap solution. A cheaper solution (and even faster) may be to “pimp” your application using the Delphi skin pack. Your application may look even better than the "classic" themes of Windows Vista / 7.
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